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Title:
Optical spectropolarimetry of radio galaxies
Authors:
Antonucci, R. R. J.
Affiliation:
AA(Lick Observatory, Santa Cruz, CA; National Radio Astronomy Observatory, Charlottesville, VA)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 278, March 15, 1984, p. 499-520. (ApJ Homepage)
Publication Date:
03/1984
Category:
Astronomy
Origin:
STI
NASA/STI Keywords:
ASTRONOMICAL SPECTROSCOPY, OPTICAL POLARIZATION, POLARIMETRY, QUASARS, RADIO GALAXIES, SEYFERT GALAXIES, EMISSION SPECTRA, VARIABILITY
DOI:
10.1086/161816
Bibliographic Code:
1984ApJ...278..499A

Abstract

This project is a search for relationships between radio and optical properties of radio galaxies. A set of 6 cm radio maps was made with the VLA, and many flux and polarization spectra were taken with the Lick 3 m telescope. The paper presents the spectropolarimetry and its relation to the radio structures. Quiescent quasar optical polarizations are all or nearly all aligned with the associated radio structure axes, Seyfert 1 polarizations tend to align with the radio sources, and Seyfert 2 polarizations are perpendicular to the radio axes. Among radio galaxies there is a significant excess of parallel objects. Among those which are not aligned, several show a perpendicular relationship. As examples of the latter case, extensive data for 3C 234 and 3C 382 are discussed and possible polarization mechanisms are modeled.

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